Development of a method for the determination of cadmium levels in seawater by flame atomic absorption spectrometry using an online cloud-point extraction system

作者：Oliveira Rafael Vasconcelos; Vieira Uelber Silva; Maciel Mardson Vasconcelos; Neri Thais Souza; Sales Graziele Santos; Menezes Rebeca Moraes; Lemos Valfredo Azevedo

来源：Turkish Journal of Chemistry, 2016, 40(6): 1055-1063.

DOI：10.3906/kim-1605-73

• Cadmium
• online preconcentration
• cloud-point extraction
• seawater

A new system was developed for the preconcentration and determination of cadmium levels in water following online cloud-point extraction and analysis by flame atomic absorption spectrometry. The method uses cloud-point extraction of the complex formed between Cd(II) ions and the reagent 2-(5-bromo-2'-thiazolylazo)-p-cresol (Br-TAC) using Triton X-114 as a surfactant. The main steps of the procedure, extraction, filtration, and detection were conducted online. Parameters that influence the experimental conditions of online preconcentration systems were examined, including pH, concentration of reagent and surfactant, and flow of sample and eluent. The limit of detection of the method is 0.2 mu g L-1. The preconcentration system exhibits an enrichment factor of 19, an analytical frequency of 60 h(-1), and a consumptive index of 0.12 mL. The procedure was applied to the determination of cadmium levels in seawater samples.

• 出版日期2016